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Finding the Fourth Proportional to 853.30, 1,275.22 and 686.94

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Solution

The fourth proportional to 853.30, 1,275.22 and 686.94 is: 1,026.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    853.30 : 1,275.22 = 686.94 : x
  2. Step 2: Convert to fraction form
    853.30/1,275.22 = 686.94/x
  3. Step 3: Cross multiply
    853.30x = 1,275.22 × 686.94
  4. Step 4: Simplify right side
    853.30x = 875,999.63
  5. Step 5: Solve for x
    x = 875,999.63/853.30
  6. Step 6: Final answer
    x = 1,026.60

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.